12. Pts who are pregnant or breast feeding, or adults of reproductive potential not employing an effective method of birth control (women of childbearing potential must have a negative serum pregnancy test within 48 hrs prior to drug administration). Post menopausal women must be amenorrheic for at least 12 months. Male & female pts must agree to employ an effective method of birth control throughout the study and for 3 months following discontinuation of study drug